JEE MAIN - Chemistry (2002 - No. 34)
Which of the following reaction is possible at anode?
2Cr3+ + 7H2O $$\to Cr_2O_7^{2-}$$ + 14H+
F2 $$\to$$ 2F-
(1/2) O2 + 2H+ $$\to$$ H2O
none of these
Explicació
$$2C{r^{3 + }} + 7{H_2}O \to C{r_2}O_7^{2 - } + 14{H^ + }$$
$$O.S.\,\,$$ of $$Cr$$ changes from $$+3$$ to $$+6$$ by loss of electrons.
At anode oxidation takes place.
$$O.S.\,\,$$ of $$Cr$$ changes from $$+3$$ to $$+6$$ by loss of electrons.
At anode oxidation takes place.